LA COMMANDE CAT SANS LES OPTIONS

/*
** cat.c
**
** Made by ali mdidech
** 
**
** Started on  Fri Oct 24 17:54:34 2003 ali mdidech
** Last update Mon Oct 27 17:13:51 2003 ali mdidech
*/

#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>

void	my_putchar(char c)
{
  write(1, &c, 1);
}

void	my_putstr(char *str)
{
  for (; *str != 0; str++)
    my_putchar(*str);
}

void	cat(char *fn)
{
  int	nb;
  int	fd;
  char	*buffer;

  fd = open(fn, O_RDONLY);
  buffer = (char *) malloc(sizeof(char) * 512);
  while ((nb = read(fd, buffer, 512)) > 0)
    write(1, buffer, nb);
  if (nb == (-1))
    {
    my_putstr("cat: ");
    my_putstr(fn);
    my_putstr(": Operation not permitted\n");
    }
  close(fd);
}

void	cat_alone()
{
  char	buffer[512];
  int	nb;

  while ((nb = read(0, buffer, 512)) > 0)
    write (1, buffer, nb);
}

int	main(int ac, char **argv)
{
  if (ac < 2)
    cat_alone();
  else
    {
      ac--;
      argv++;
      while (ac-- > 0)
	if (*argv[0] == '-')
	  cat_alone();
	else
	  cat(*argv++);
    }
  return (0);
}